// ConditionalNode.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;

using Irony.Compiler;
using Irony.Compiler.AST;

using Microsoft.Linq;
using Microsoft.Linq.Expressions;

namespace Bechamel
{
	
	public class ConditionalNode : BechamelNode
	{
		AstNode test;
		AstNode ifTrue;
		AstNode ifFalse;

		
		public ConditionalNode(NodeArgs args, AstNode test, AstNode ifTrue, AstNode ifFalse)
			: base(args)
		{
			this.test = test;
			this.ifTrue = ifTrue;
			this.ifFalse = ifFalse;
		}

		public override Expression GenerateExpression (ETGenerator generator)
		{
			Expression testExpr = generator.GetExpressionFromAst(test);
			if (testExpr.Type != typeof(Boolean))
				testExpr = Expression.Unbox(testExpr, typeof(Boolean));
			Expression left = generator.GetExpressionFromAst(ifTrue);
			Expression right = generator.GetExpressionFromAst(ifFalse);

			if (left.Type != right.Type) {
				left = Expression.TypeAs(left, typeof(Object));
				right = Expression.TypeAs(right, typeof(Object));
			}
			
			return Expression.Condition(testExpr,
			                            left,
			                            right);
		}

	}
}
